See sharing some links from other parties isn't allowed on our platform so I won't be able to. So you please can google this and can get tons of things available for the same chapter. As far as what I can do for you is I can guide you a bit with that chapter.. I personally suggest you to complete the full chapter from GOVERNMENT SANCTIONED TEXTBOOK and complete all the sums-solved examples and exercise and then go for some books or question set.
As of now solve this 5 questions to increase your confidence...
1.In a 12-storey house ten people enter a lift cabin.It is known that they will leave the lift in groups of2,3 and 5 people at different storeys.The number of ways they can do so if the lift does not stop up to the second storey is
2.A committee of 5 is to be formed from 9 Ladies and 8 men. If the committee commands a lady majority, then the number of ways this can be done is
3.If a polygon has 44 diagonals ,then the number of its sides are
4.A set contains (2n+1) elements. If the number of subsets of this set which contain almost n elements is 4096,then the value of n is
5.Ten different letters of an alphabet are given. Words with 5 letters are formed from these given letters. Then the number of words which have at least one letters repeated is
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